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[aprssig] APRS Telemetry

scott at opentrac.org scott at opentrac.org
Wed Sep 6 15:31:23 UTC 2006

I'm not too keen on overloading the TOCALL with yet another meaning.  I'd
rather see some sort of extensible telemetry format that includes unit
specifiers.  Field labels in a separate message would be nice, but I say
ditch the coefficients and put the conversion burden on the originating

For the record, the OpenTracker's standard format is temperature, voltage,
(undefined extra ADC), counter, GPS HDOP.  It's used in a few alternative
power applications.


> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert Bruninga
> Sent: Wednesday, September 06, 2006 7:34 AM
> To: 'TAPR APRS Mailing List'
> Subject: [aprssig] APRS Telemetry
> I'm considering a new Symbol for APRS to represent alternative
> power
>  systems, so that owners can monitor their off-grid power
> systems in
>  a standard way remotely.  Also, then we can make summaries of
>  users contributions to alternative energy.  Here are some of
> the
>  ideas I am considering:
> 1) Alternative energy symbol (with overlay for Wind, Thermal,
> Water or Sun)
> 2) Standard telemetry formats using the existing KPC-3+ five
> channel packets
> 3) TOCALL version numbers to match the formats so that parsers
> can display
>    end units wihtout any other info.
> For this purpose, I would like to build a table of all existing
> KPC-3+ telemetry 5-channel systems so we can see if some
> standards exist.  
> Here are 3 that might be useful for alternative energy systems:
> 1) System Volts,  Charge Current,  Load Current,  Panel
> Temperature, Indoor temp
> 2) System Volts,  Charge Current,  Load Current,  Battery
> Current,  Temp
> 3) System A volts,  System A current,  System B volts,  System B
> current, Temp
> Each of these would have a different APExxx version number, so
> that decoding
> Systems can decode and display them without any other
> knowledge...
> Anyone that is running off-grid or with alternative energy
> systems of any
> Kind, I would like to hear from you as well, even if you are not
> using a
> KPC-3+ for telemetry...
> Bob, WB4APR
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